目录1、友元函数是什么？2、友元函数的关键字friend2.1、class外定义的函数在某个class中说明为这个类的友元函数2.2、将其他类的成员函数声明为友元函数3、友元类总结1、友元函数是什么？
Background: We are in the process of writing a registration/payment page, and our philosophy was to code all validation and error checking on the server side first, and then add client side validation
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